Question

I have a table as

mysql> select * FROM testa;
+---------+-------+
| month_x | money |
+---------+-------+
| 11101   | 12345 |
| 11105   |   100 |
| 11105   |   100 |
| 11105   |   100 |
| 11105   |   100 |
| 11106   | 12345 |
+---------+-------+
6 rows in set (0.00 sec)

where last two digits in the month_x are months now i want my output as

Month   TOTAL
01  12345
02  0
03  0
04  0
05  400
06  12345
07  0
08  0
09  0
10  0
11  0
12  0

IS possible using the If else or case.

Answer 1

For this you need to create a table first with months’ numeric value in it.

CREATE TABLE `months` (
  `mon` int(11) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8
INSERT INTO `months` VALUES (1), (2), (3), (4), (5), (6), (7), (8), (9), (10), (11), (12);

Then execute this query,

SELECT m.mon, 
       IF(Sum(t.money) IS NULL, 0, Sum(t.money)) AS `money` 
FROM   testa t 
       RIGHT OUTER JOIN months m 
         ON ( t.month_x%100 = m.mon ) 
GROUP  BY m.mon; 

Result is,

+------+-------+
| mon  | money |
+------+-------+
|    1 | 12345 |
|    2 |     0 |
|    3 |     0 |
|    4 |     0 |
|    5 |   400 |
|    6 | 12345 |
|    7 |     0 |
|    8 |     0 |
|    9 |     0 |
|   10 |     0 |
|   11 |     0 |
|   12 |     0 |
+------+-------+